YouTube Thumbnail Prompt

Act as an experienced design / image specialist. Complete this specific task: YouTube Thumbnail Prompt.

User context:
- subject: {{subject}}
- visual_style: {{visual_style}}
- brand_colors: {{brand_colors}}
- requirements: {{requirements}}

Before answering, identify the objective, intended audience, constraints, and missing information. If a critical detail is absent, state one reasonable assumption instead of inventing facts.

Build the response around the exact task "YouTube Thumbnail Prompt". Provide a practical deliverable the user can apply immediately, not a generic explanation. Organize the answer with clear headings, prioritized steps, concrete examples, and a final checklist. Where a claim depends on current or external information, label it for verification. Do not invent personal experience, statistics, quotations, sources, product capabilities, or links.

Quality requirements:
1. Match the requested audience, tone, format, and length.
2. Explain important trade-offs and edge cases relevant to YouTube Thumbnail Prompt.
3. Separate confirmed inputs from assumptions.
4. Include at least one realistic example tailored to the supplied context.
5. End with clear next actions and a verification checklist.

Return only the useful final deliverable for YouTube Thumbnail Prompt.